Apparatus for severing the edges of glass sheets



Jan. 21 1930; H. 3;, HALBYACH ETAL 1,744;046

' 'APPAIRA'VI'QS. FOR savanna THE. mass or GLASS rsxi'im'rsv mad Sept. 21, 1923 ,5 Shets-Sheet 1 1115.21,, 1930, f H. LIHALBACH'ETAL' 1,744,046

APPARATUS FOR SB VEBING, THE EDGES OF GLASS SKEETS Filed Sept. 21, 1928 Sweets-sheet 2 Z1 Z3 g lNVENTORb JW 351W BW E' QZWM Jan. 21', 1930. H. L. H ALBACH ET Ai 1 ,744,046

"APPARATUS FOR SEVERING THE EDGES 0F GLASS SHEETS s Sheets-Sheet 5 Ei-lgd Sgpt. 21. 1928 mVENTQRS I Patented Jan. 21, 1930 UNITED. sTA Es sronog 'ro Vania.

PATENT OFFICE HOWARD, Lh H ALZBAGH AND DON B. LIMBERS, 9F CLARKSI BUBG, "WEST VIRJGTNQTA, AS-

PITTSBURGH PLATE GLASS COMPANY, AACORIPORATION F PEiN'NSYL- APPARATUS ron' sitvrnmwdv mt ,EDGES or dress snnn'rs when... and September 21, 1928. 7 Serial in. 307,442.

The invention relates to an apparatus ior severing the'edges of a continuously formed 1 glass sheet. The invention is designed particularly for use with the severin apparatusshown in the Slinglufi Patent 0. 1,373,533,

but is not limited to use with such apparatus. .It constitutes a modification of the hp aratus shown in the application of H. L. albach,

. Serial Number 251,146. The present 'construction differs from that of theHalbach application-in that the edge severing means are supportedindependentlyof the. transverse severing means instead of being carried thereby. The invention has for its objects the provisionof an edge severin device wherein the heat may be applied to t e edge severing strips orelements inadvance of theapplication of the heat to, the transverse sev-fl ering elements, and in which the edge sev a0 ering strips may'beadjustedindependently to meet requirements. Certain embodiments of the invention are illustrated in the 'accom-' panying drawings, wherein Figure l'is a side elevation. Fi 2 is a '25 horizontal section on the line II--I of Fig.

1. Fig. 3 isa front view. Fig; 4 is anenlarged section also taken on the line II-II of Fig. 1. And Figs. 5 and Bare detail sections showing modifications. t p Referring to the drawin s, 1 is the floor above which the cutting o apparatus is 10- cated,the drawing machine which produces the continuously upwardl moving glass sheet 2 being located on the odr; beneath. A

" platform 3 carries the severing apparatus.

' The device for cutting the sheet into sections (shown in the patent and application above referred to) constitutes no-partof the pres- .ent invention, but becauselofji-ts relation to 4 the edgetrimming devices,aisshown on the drawings and will be brieflyfdescribed. It

comprises a pair of transverse-bars 4 and 5 on opposite sides of the glass sheet and each provided 1 with a resistance ribbon. These 4 bars arecarried byframes 6, 6sup or'ted by cables7 7fpassing around the pu leys 8, '8 and 9, 9 carried upon the standards 10,- 10', iwei hts 11 beihg secured to the ends of the cabesascounterweights. Current is supplied to the ribbonsbymean sfofthe leads 12,

.l- The arm 32 is pivoted t44: upon a standard 12 and the frames, when in lowered position, 1

rest on stop blocks 13, 13 (Fig. 3). The bars'4 and.5 are moved toward each other to en" age the glass sheet'by means of the soleno ds 14, 14 whose rods. 15, 15am connected throu h the toggles 16, 16 with the levers 17,

17. hese-levers are pivoted to the frames f6, S at 18, 18, and carry the bars 4 and 5 at their lower ends. The springs 19, 19 serve to move the bars 4-and 5 away from the glass after current to the solenoid windings is cut off. Such current is supplied through the leads 20, 20. 1

The edge trimming equipment consists of a device at each edge of the sheetwhich are duplicates, so that a description of one device will suffice-for both. This device includes a a vertical bar 21 having the form of a chanml in cross section (Fig. 4) A strip of insulating material 22 is mounted in the chan nel' and supports a resistance ribbon 23. The

ribbons are connected to the leads 12, 12 by indicated in Fig. 3.

The bar 21 has secured to its rear side the guide bars 27 and 28 which extend slidably oted to asupporting arm 32 at 33. Sprmgs 34,34 cushionthe downward movement of the bar 21' with respect to the brackets 29 and 30. The bar 21 is counterbalanced by means means of the connections 24,25 and 26, as I through the brackets 29 and 30- forming a part of the frame 31, such frame being iv- I of a weight'35 and a cable36 secured to the Y I bar at 37 and extending over the pulley 38 journaled at 39 on the frame 31. The weight is guided upon a rod 40 secured to the frame 31. 1he frame is supported'in any desired position of adjustment about its pivot-33 bymeans of the brace 41 secured at its lower end to a lugon the arm 32 by means of a pivot pin 42. The n and clamped y a thumb screw 43," whose pper end oi the brace is slotted shank extends through the slot and is threadsed into the up 'er-end of the frame.

.45. Thisstandard is vertically adjusted in a base'46, being held in'adjusted position by the arm 32. The arm 32 is provided with a counterweight51. The base 46 is flanged (Fig. 1) and mounted for lateral movement in the guide plate 52.bolted to the platform 3. This permits the base to be adjusted lateral lyso that the resistance ribbon may be -pos1tioned'at the proper distance from the edge of the sheet, as the width of the sheet may vary somewhat from time to time. The base is locked in adjusted position by means I of the screws 53, 53 (Fig. 3).

In operation, current is supplied through the leads 12, 12 before the solenoids 14,- 14

are energized to clamp the bars 4, 5 to the glass. The ribbons 23, 23 thus heat lines along the'edgesof the glass before the ribbons carried by the bars 4, 5 'engagethe glass. After the solenoids are energized, thus clamping the bars 4, 5 to the glass, such bars move up with the glass until the blocks 54 carried by the bar 5 eng'agethe blocks 55 carried by the channel 21, after which such channel moves upward with the bars during the re- I mainder of the heating period, the guide bars 27 and 28 carried by the channel sliding through the brackets 29 and 30. Current to the leads 12, 12 and 20, 'is then cut otf.

The bars "4 and 5 are now separated by the springs 19, 19 and a wctted tool is applied to the end of the heated line-across the sheet, causing the glassto crack ofl along such line.

The operattgr grasps the sheet just efore'such cracking 0 operation to support it, and when the sheet is separated, he carries it to a rack and. deposits it there: He then applies a wetted tool to the ends of the heated lines which have been in contact with the ribbons 23, 23,causing the edges to crack ofl along the lines of heating. After the sheet has been sheet ordinarily departs from a vertical plane somewhat, and the degree of departure varies from time to time. The supporting of the frame on the pivoted arm 32 is also desirable as this provides means for giving the ribbon on the bar 21 a yielding engagement with the glass which-can be adjusted in degree by moving the counterweight 51 in and out. The stop screw prevents-the device from tilting too far forward after the glass sheet has been cut off andremoved. The standard 45 may be adjusted vertically to regulate the height of the bar 21 above the latform, and the lateral-adjustment of the Ease 46in the plate 52 permits the device to be adjusted to suit sheets of varying widths.

Figs. 5 and 6 show modifications in which means are provided to keep the heating ribbons 23 out of contact with the glass so that the glass ishea'ted by radiation rather than \by direct contact. This rotects the ribbons from wearing away incident to the sliding contact with'the glass, but more heat is re-. quired. In the Fig. 5 construction, the ribbon is set into a groove in the insulatin strip 56, while in the-Fig. 6 construction, a bar 57 of asbestos board or the 'like is secured to the side of the bar 21 and engages the glass in the manner illustrated so that the ribbon is maintained out o'f'contact with the glass.

Whatwe claim is:

1. Apparatus for separating the edge of an upwardly moving sheet of glass, comprising a heating element extending longitudinally of the sheet adjacent the edge thereof, a fixed su porting member, a second sup,- portin mem er pivoted on said fixed member an carrying said heating element so that the element is free to adjust itself to the position of the sheet, and means for causing a flow of electric current through said element to heat it. 5

2. Apparatus for separating the edge of an upwardly moving sheet of glass, comprising a'fixed supporting member, an arm extending transversely of the plane of the sheet pivoted to said member, an upright heating element carried by said arm and adapted to engage the sheet adjacent its edge, and means for causing a flow of current through-said element to heat it, a

3. Apparatus for separating the edge ofa'n upwardly moving sheet of glass, comprising a fixed supporting member, a counterbalanced arm extending transversely of the plane of the sheet pivoted to said member, an upright heating element carried by said arm and adapted to engage the sheet adjacent its edge, and means for causing a flow of current through said element to heat it.

4. Apparatus for separating theedge of an upwardly moving sheet of glass, comprising. a fixed supporting member, an arm extending transversely of the plane of the sheet pivoted to said member, an upright guide carried by said arm, a heating element mounted for vertical movement along said guide and adapted to engage the sheet adjacent its edge, and means for causing a flow of current through said element to heat it.

5. Apparatus for separating the edge of an upwardly moving sheet of glass, comprising a fixed supporting member, anarm extending transversely of the plane of the sheet pivoted to said member, an upright guide carried by said arm, .a heating element mounted for vertical movement along said guide and adapted to engage the sheetadjacent its edge,'means for counterbalancing said ele ment, and means for causing a flow of current through said element to heat it.

v6. Apparatus for separating the edge of an upwardly moving sheet of glass, comprising a fixed supporting member,- an 'arm ,extending transversely of the plane of the sheet pivoted to said membey, an upright guide car ried 'by said arm, a heating element mounted for vertical movement along said guide and adapted to engage the sheet adjacent its edge, means for counter-balancing said element, means movable With the sheet for-en aging the element and moving it upwar and means for causing a flow of current through said element to heat it.

In testimony whereof, We have hereunto subscribed our names.

' e i HOWARD L. HALBACH.

' DON. R. LIMBERS. 

